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Explanation:
When making incompatible changes to a Dataflow pipeline with Pub/Sub as the source, creating a new pipeline with a new Pub/Sub subscription ensures no data loss. This approach allows you to:
NO.37 You have Google Cloud Dataflow streaming pipeline running with a Google Cloud Pub/Sub subscription as the source. You need to make an update to the code that will make the new Cloud Dataflow pipeline incompatible with the current version. You do not want to lose any data when making this update. What should you do?
A
Update the current pipeline and use the drain flag.
B
Update the current pipeline and provide the transform mapping JSON object.
C
Create a new pipeline that has the same Cloud Pub/Sub subscription and cancel the old pipeline.
D
Create a new pipeline that has a new Cloud Pub/Sub subscription and cancel the old pipeline.
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